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Title (Primary) Colonization in Mediterranean old-fields: the role of dispersal and plant–plant interactions
Author García-Cervigón, A.I.; Velázquez, E.; Wiegand, T.; Escudero, A.; Olano, J.M.;
Journal Journal of Vegetation Science
Year 2017
Department OESA; iDiv;
Volume 28
Issue 3
Language englisch;
POF III (all) T53;
Keywords Age–size relationships; Herbivory; Juniperus communis ; Juniperus sabina ; Pinus sylvestris ; Plant–plant interactions; Seed dispersal syndrome; Spatial point-pattern analysis
UFZ wide themes RU5;
Abstract

Questions

How do the dominant species in a Mediterranean community (Juniperus sabina, Juniperus communis and Pinus sylvestris) colonize abandoned fields? At what rates? Does dispersal limitation shape species colonization patterns? Does J. sabina act as nurse plant for the other two species? If so, in which stages of development: seedlings and saplings or older individuals?

Location

Abandoned crop fields in the Alto Tajo Natural Park, central-eastern Spain.

Methods

We mapped all individuals of the three species in three 4–14-ha plots, and aged them using dendrochronology. Spatial patterns in 2000, 1980 and 1960 were reconstructed according to estimated ages in 2014. We used a battery of spatial point-pattern analyses to evaluate dispersal in junipers, dispersal in pines, and the role of J. sabina as nurse plant for the other two species.

Results

Both junipers colonized earlier than pines, probably due to their more effective endozoochorous dispersal. Late-coming pines, once established, expanded faster due to their higher seed productivity. Recent recruits of J. communis and P. sylvestris showed a random relationship with J. sabina canopies, whereas spatial patterns of older individuals in relation to J. sabina canopies ranged from attraction (plot 2 and marginally plot 1), suggesting facilitation, to repulsion in plot 3. These differences in spatial patterns between plots could be related to a shift in dominant herbivores, from sheep (plots 1 and 2) to red deer (plot 3).

Conclusions

Dispersal and plant–plant interactions drove colonization in Mediterranean old fields. The inclusion of a temporal perspective in the analysis of spatial patterns allowed the detection of shifting interactions between J. sabina and the other two species, depending on their life stage. This is a clear advance compared with the usual static analyses, as it provides additional clues to interpret the mechanisms and processes underlying their origin.

ID 18859
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=18859
García-Cervigón, A.I., Velázquez, E., Wiegand, T., Escudero, A., Olano, J.M. (2017):
Colonization in Mediterranean old-fields: the role of dispersal and plant–plant interactions
J. Veg. Sci. 28 (3), 627 - 638